Home / Standards / GB/T 5281-1985 GB/T 5281-1985 Active Hexagon socket head shoulder screws 内六角圆柱头轴肩螺钉 Standard Type GBT ICS 21.060.10 CCS J13 Status 现行 Issue Date 1985-08-01 Implementation 1986-06-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A